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Related Experiment Videos

Enhanced vortex damping by eddy currents in superconductor-semiconductor hybrids

Danckwerts1, Goni, Thomsen

  • 1Institut fur Festkorperphysik, Technische Universitat Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany.

Physical Review Letters
|October 6, 2000
PubMed
Summary

Coupling superconducting films to an electron gas enhances vortex damping. This reduces power dissipation, stopping vortex channels and improving superconducting device performance.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Superconducting films exhibit vortex motion, leading to energy dissipation.
  • Controlling vortex dynamics is crucial for superconducting device applications.

Purpose of the Study:

  • To investigate the enhancement of vortex-motion damping in lead-indium (Pb/In) superconducting films.
  • To explore the effect of coupling with a two-dimensional electron gas (2DEG) on vortex dynamics.

Main Methods:

  • Fabrication of a heterostructure combining Pb/In superconducting films with a modulation-doped GaAs/AlGaAs heterostructure.
  • Measurement of power dissipation in the superconductor under varying gate voltages to control 2DEG density.
  • Comparison of experimental results with theoretical calculations based on a viscous damping model.

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Main Results:

  • Observed significant enhancement of vortex-motion damping in Pb/In films coupled to a 2DEG.
  • Demonstrated that increasing 2DEG density modulates vortex damping.
  • Achieved quantitative agreement between experimental data and the viscous damping model incorporating eddy currents.

Conclusions:

  • Coupling to a 2DEG effectively enhances vortex damping in superconducting films.
  • Eddy current generation in the 2DEG by moving flux lines is the primary mechanism for damping.
  • This phenomenon leads to a notable dissipation breakdown in the filamentary vortex flow regime, enabling vortex channel stopping.